Further to INPUT_PULLUP, if you put a 47k to another Arduino pin - and you only need one such pin for all the connections - you can set it alternately HIGH or LOW to fully assess tri-state pins.
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Further to INPUT_PULLUP, if you put a 47k to another Arduino pin - and you only need one such pin for all the connections - you can set it alternately HIGH or LOW to fully assess tri-state pins.